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Pull requests: pandas-dev/pandas
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PERF: compute kurtosis for ExtensionArray using groupby method Groupby Performance Memory or execution speed performance Reduction Operations sum, mean, min, max, etc.
PERF: Avoid deep copies when casting dtypes in merge Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
PERF: Shallow copy Series in timeseries plotting Performance Memory or execution speed performance Visualization plotting
PERF: Assign unique for monotonic but not strictly monotonic index Index Related to the Index class or subclasses Performance Memory or execution speed performance
[READY] perf improvements for strftime Datetime Datetime data dtype Performance Memory or execution speed performance Stale
#51298 by smarie was closed Oct 5, 2025 Loading… updated Oct 5, 2025
5 tasks done
Free dynamically allocated memory prior to returning error Performance Memory or execution speed performance
BUG: Fix Memory Leak in to_json IO JSON read_json, to_json, json_normalize Performance Memory or execution speed performance
PERF: Restore old performances with .isin() on columns typed as np.ui… isin isin method Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
perf: improve membership check performance in column filtering IO CSV read_csv, to_csv Performance Memory or execution speed performance
PERF: Improve merge performance Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#57559 by phofl was closed Apr 15, 2025 Loading… updated Apr 15, 2025
5 tasks
Bug: Save original index and remap after function completes Filters e.g. head, tail, nth Performance Memory or execution speed performance
PERF: future_stack=True with non-MulitIndex columns Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
PERF: Avoid a numpy array copy in ArrowExtensionArray._to_datetimearray Arrow pyarrow functionality Performance Memory or execution speed performance
PERF: Fix ASV CSV benchmarks IO CSV read_csv, to_csv Performance Memory or execution speed performance
PERF: improve construct_1d_object_array_from_listlike Constructors Series/DataFrame/Index/pd.array Constructors Performance Memory or execution speed performance
Backport PR #60461 on branch 2.3.x (PERF: improve construct_1d_object_array_from_listlike) Constructors Series/DataFrame/Index/pd.array Constructors Performance Memory or execution speed performance
PERF: faster _coerce_to_data_and_mask() for astype("Float64") NA - MaskedArrays Related to pd.NA and nullable extension arrays Performance Memory or execution speed performance
PERF: Native version of hash_pandas_object Performance Memory or execution speed performance Stale
is_hashable hashing #59565 by Tolker-KU was closed Oct 29, 2024 Loading… updated Oct 29, 2024
1 of 5 tasks
BUG/PERF: Series.combine_first converting int64 to float64 Bug Dtype Conversions Unexpected or buggy dtype conversions Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#51777 by lukemanley was merged Mar 10, 2023 Loading… updated Sep 13, 2024
5 tasks done
PERF: CategoricalDtype.update_dtype Categorical Categorical Data Type Performance Memory or execution speed performance
PERF: Only clear cached .levels when setting MultiIndex.names MultiIndex Performance Memory or execution speed performance
PERF: Improve efficiency of Memory or execution speed performance
BlockValuesRefs._clear_dead_references(...) Copy / view semantics Performance Previous Next
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